1. Check XIAOMI REDMI NOTE 7 camera permissions 2. Check if another app is already using the XIAOMI REDMI NOTE 7 Camera 3. Force Stop XIAOMI REDMI NOTE 7 Camera 4. Cool down the XIAOMI REDMI NOTE 7 5. Clear the XIAOMI REDMI NOTE 7 Camera Cache 6. Restart the XIAOMI REDMI NOTE 7 7. Update Android on XIAOMI REDMI NOTE 7 8.1. Check XIAOMI REDMI 7 camera permissions When you first open the Camera app, it asks for permission to access the device's storage. However, some recent update on your phone may have changed the permissions. Therefore, check whether the Camera app has the relevant permissions or not. Try restarting your phone. Check the camera permissions. There are two ways to give the permissions back to this particular app, here is the easier one. If the above methods do not solve your problem, he is one more solution you can try which has been shared by a Xioami user.
If the camera does work then it the Camera app that's glitching out and you just have to clear the cache and the data of the camera app. Tell me if this fixes your issue and makes your camera work without displaying error messages.